I have migrated afew users from BES 3.6 to 4, and have noticed that by default their time is 1 hr behind (set to Casablanca and not Dublin, London). I have checked the server (date/time, regional settings and all is set to London GMT), where can I set this so that default its set to London.

I'm not too sure if this has anything to do with the issue but there is a problem with the cdo.dll file causing a mix up in daylight savings time because there are 5 weekends in October. The code that MS put into cdo.dll says change the clocks on the 4th weekend of october and not the last weekend. THere is a fix for xch 5.5 and 2000 but i still haven't found one for xch 2003 (sp2 is also affected.)
It will sort itself out next week!